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US 11,891,569 B2Granted
Diverting agent and method of filling fracture in well using the same
AssigneeMitsubishi Chemical Corporation
InventorsYasuhiro Hirano, Ryosuke Taniguchi, Chizuko Furo
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Abstract
A diverting agent is provided which has solubility in water that can be controlled excellently and which does not easily dissolve at an early stage of filling of fractures in a well in excavation method using a hydraulic fracturing method and dissolves in water and can be easily removed after filling is no longer needed. The diverting agent contains powdery polyvinyl alcohol-based resins having an average particle diameter of 800 to 2000 μm.
Claims6
A diverting agent, comprising:
- powdery polyvinyl alcohol-based resins having an average particle diameter of 800 to 2000 μm, wherein:
- when 1 g of the polyvinyl alcohol-based resin is immersed in 100 g of water at 23° C. for an hour, the residual rate of the polyvinyl alcohol-based resin is 50 mass % or more, and
- when 1 g of the polyvinyl alcohol-based resin is immersed in 100 g of water at 40° C. for seven days, the residual rate of the polyvinyl alcohol-based resin is 10 mass % or less.
Dependencies are inferred from the claim text.